package Demo5;

import java.text.SimpleDateFormat;
import java.util.Date;

public class ThreadSleep2 {

    public static void main(String[] args)  {
//        try{
//            tenDown();
//        }catch (InterruptedException e){
//            e.printStackTrace();
//        }

        // 打印当前的系统的时间
        Date dateTime =  new Date(System.currentTimeMillis());// 获取当前的系统时间
        while (true){
            try {
                Thread.sleep(1000);
                System.out.println(new SimpleDateFormat("HH:mm:ss").format(dateTime));
                dateTime = new Date(System.currentTimeMillis());//更新当前时间
            } catch (InterruptedException e){
                e.printStackTrace();
            }
        }
    }

    // 模拟倒计时
    public static void tenDown() throws InterruptedException {
        int num = 10;
        while (true){
            Thread.sleep(1000);
            System.out.println(num--);
            if (num<=0){
                break;
            }
        }
    }
}
